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Income Taxes (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2019
Jan. 01, 2019
Dec. 31, 2018
Operating Loss Carryforwards [Line Items]        
Decrease in deferred tax assets $ 205.2      
Valuation allowance   $ 492.4   $ 552.5
Impact of ASU 2018-02     $ (1.3)  
All U.S. and Portion of Icelandic Deferred Tax Assets [Member]        
Operating Loss Carryforwards [Line Items]        
Valuation allowance   $ 492.4    
Accounting Standards Update 2018-02 [Member]        
Operating Loss Carryforwards [Line Items]        
Impact of ASU 2018-02     $ 1.3